EP2592433B1 - Évaluation de la distance - Google Patents

Évaluation de la distance Download PDF

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Publication number
EP2592433B1
EP2592433B1 EP11360050.6A EP11360050A EP2592433B1 EP 2592433 B1 EP2592433 B1 EP 2592433B1 EP 11360050 A EP11360050 A EP 11360050A EP 2592433 B1 EP2592433 B1 EP 2592433B1
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EP
European Patent Office
Prior art keywords
frequency
dependent
network access
path losses
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11360050.6A
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German (de)
English (en)
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EP2592433A1 (fr
Inventor
Holger Claussen
Irwin Kennedy
Senad Bulja
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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Publication date
Priority to EP11360050.6A priority Critical patent/EP2592433B1/fr
Application filed by Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Priority to CN201280054533.7A priority patent/CN103917888A/zh
Priority to IN3411DEN2014 priority patent/IN2014DN03411A/en
Priority to JP2014540349A priority patent/JP2015507172A/ja
Priority to US14/357,010 priority patent/US20140323151A1/en
Priority to KR1020147010052A priority patent/KR20140069165A/ko
Priority to PCT/EP2012/004608 priority patent/WO2013068095A1/fr
Publication of EP2592433A1 publication Critical patent/EP2592433A1/fr
Application granted granted Critical
Publication of EP2592433B1 publication Critical patent/EP2592433B1/fr
Not-in-force legal-status Critical Current
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements

Definitions

  • the present invention relates to a method, a network access node and a computer program product.
  • a wireless telecommunications network it is desirable to be able to identify the location of, for example, user equipment in order to enable operators to provide location and presence-based services to users.
  • the effectiveness of these services increases with the accuracy with which it is possible to determine the location of the user equipment.
  • US 2009/047973 A1 discloses a method of obtaining a local path loss versus range model in a radio communications network. At least one path loss measurement and associated range measurement is obtained and applied to a path loss versus range model. The local model may also be used to obtain a more accurate location of a mobile radio terminal.
  • US 6,990,428 B1 discloses a method for determining the location of a wireless station.
  • the first aspect recognises that a problem with existing techniques for estimating a network node location is that they all have limitations, particularly in indoor environments.
  • the satellite signals in a GPS system are usually insufficient to provide a location estimate in an indoor environment.
  • Cell identification methods are possible, but their accuracy is limited by the cell size and many cells may need to be deployed to provide highly accurate location information which is expensive and leads to a high increase in mobility signalling.
  • Cellular triangulation techniques exploiting timing differences of received signals from multiple base stations have accuracy limited to several tens of metres and small cells indoors cannot be used due to insufficient timing differences resulting from the short distances.
  • Power-based finger printing using power measurements from multiple base stations cannot be used for accurate location estimation without a database of power measurements existing for all locations in the building which enables measurements made by the network node to be matched to the most likely location; although this can lead to accurate location estimation, the creation of such a database is a time-consuming and expensive process which needs to be performed whenever the environment changes.
  • the first aspect also recognises that it is difficult to estimate the distance to a network node based on transmissions received because those transmissions will be subjected to losses caused by obstructions (such as walls or other physical objects) and interference between the network nodes.
  • the losses caused by those obstructions or interference are typically frequency-dependent.
  • the path losses caused by obstructions or other interference are typically frequency-dependent, whereas the path loss in free space is frequency-independent. That is to say, the path loss experienced in free space at different frequencies will typically be the same, whereas the path loss through obstructions at different frequencies will vary.
  • a method of estimating a distance between network nodes may be provided.
  • the method may comprise measuring the total path losses between network nodes on at least two different frequencies.
  • the frequency-dependent path losses of transmissions made by a network node on the different frequencies may then be determined.
  • a distance may then be estimated between the network nodes using the total path losses and the frequency-dependent path losses on the different frequencies.
  • Measurement reports may be sent back to the originating network node to enable the path loss between the network nodes to be established on the different frequencies.
  • the frequency-dependent path losses are determined from a difference in the total path losses on each different frequency between the at least one network access node and the network node. Accordingly, the frequency-dependent path losses may be calculated from the difference between the path losses on the different frequencies.
  • the frequency-dependent path losses are determined from transmissions on each different frequency between at least two network access nodes.
  • the frequency-dependent path losses may be determined based on pilot signals transmitted between network nodes.
  • the frequency-dependent path losses are determined from transmissions on each different frequency between at least three network access nodes. By determining the frequency-dependent path losses between at least three network nodes, the frequency-dependent path losses within a region bounded by the at least three network nodes may be determined.
  • the frequency-dependent path losses are determined from transmissions on each different frequency and a distance between network access nodes. Accordingly, the frequency-dependent path losses may be determined using the transmissions and the distance between network nodes. It will be appreciated that the location of or distance between many static network nodes may be readily determined. Likewise, it may be possible to perform such measurements based on requiring a mobile network node to operate at a pre-defined location to determine the path losses.
  • the method comprises determining an average frequency-dependent path loss on each different frequency between network access nodes. Accordingly, an average frequency-dependent path loss on each frequency may be determined for a particular region.
  • the frequency-dependent path losses at each different frequency are determined using an effective frequency-dependent attenuation between the network access nodes.
  • the effective frequency-dependent attenuation is determined using a path loss measured at each different frequency between the network access nodes and a distance between the network access nodes.
  • the method comprises determining an average effective frequency-dependent attenuation on each different frequency between the network access nodes.
  • the frequency-dependent path losses are determined from predetermined frequency-dependent path losses approximated for different deployment environments. Accordingly, rather than determining the frequency-dependent path losses based on actual transmissions between network nodes, the frequency-dependent path losses may be approximated based on knowledge of the environment in which the network nodes are deployed. For example, a set of approximated frequency-dependent path losses may be derived and then utilised when required. The set may, for example, include frequency-dependent path losses for typical office configurations, one of which may be selected based on knowledge of the physical characteristics of the environment that the network nodes are to be deployed.
  • the distance is estimated from a corrected path loss determined by removing the frequency-dependent path losses from the total path losses on each different frequency. Accordingly, the distance may be determined from a standard path loss model which uses a corrected path loss which cancels the frequency-dependent path losses on each frequency.
  • the distance is estimated using the total path loss, a transmission power and the average effective frequency-dependent attenuation on each different frequency.
  • the method comprises estimating a distance between the network node and each of the network access nodes. It will be appreciated that by increasing the number of network nodes to which the distance is estimated, location estimation can be improved.
  • a network node as claimed in claim 14.
  • the frequency-dependent path losses are determined from a difference in the total path losses on each different frequency between the at least one network access node and the network node.
  • the frequency-dependent path losses are determined from transmissions on each different frequency between at least two network access nodes.
  • the frequency-dependent path losses are determined from transmissions on each different frequency between at least three network access nodes.
  • the frequency-dependent path losses are determined from transmissions on each different frequency and a distance between network access nodes.
  • the determining logic is operable to determine an average frequency-dependent path loss on each different frequency between network access nodes.
  • the frequency-dependent path losses at each different frequency are determined using an effective frequency-dependent attenuation between the network access nodes.
  • the effective frequency-dependent attenuation is determined using a path loss measured at each different frequency between the network access nodes and a distance between the network access nodes.
  • the determining logic is operable to determine an average effective frequency-dependent attenuation on each different frequency between the network access nodes.
  • the frequency-dependent path losses are determined from predetermined frequency-dependent path losses approximated for different deployment environments.
  • the distance is estimated from a corrected path loss determined by removing the frequency-dependent path losses from the total path losses on each different frequency.
  • the distance is estimated using the total path loss, a transmission power and the average effective frequency-dependent attenuation on each different frequency.
  • the estimating logic is operable to estimate a distance between the network node and each of the network access nodes.
  • a computer program product operable, when executed on a computer, to perform the method of the first aspect.
  • the losses between a network access node such as, for example, a base station and another network node such as, for example, user equipment are estimated. These estimates may be made by an operator based on an assessment of the deployment environment or by measurements made by network nodes. For example, network nodes may perform path-loss measurements L P1 and L P2 at at least two different frequencies, f 1 and f 2 (for example, f 1 could be set to 900 MHz (the GSM spectrum) and f 2 could be set to 1.9 or 2.6 GHz (the LTE spectrum)). To enable the two path-loss measurements to be made, the base station transmits pilot signals in each frequency bands.
  • the path loss for both frequencies caused by the walls L W1 and L W2 can be calculated based on the difference in the path loss measurements because the attenuation properties through different materials at different frequencies are known or can be derived, as will be explained in more detail below.
  • L PC L P1 - L W1 .
  • the corrected path loss the distance between the base station and the user equipment can be accurately estimated using the corrected path loss L PC and a path loss equation such as, for example, the free space path loss equation.
  • the location of user equipment can be calculated using known triangulation methods when the distance to at least three base stations is determined.
  • Figure 1 illustrates principles of a method for estimating the distance between network nodes.
  • the network nodes are a base station and user equipment.
  • the base station transmits two pilots on two different frequencies f 1 and f 2 .
  • the connected user equipment send measurement reports detailing received power measurements of the pilot signals.
  • the measurement reports are used to calculate the path loss for the links between the base station and the user equipment.
  • the path loss can readily be determined by subtracting the received power measurements reported by the user equipment from the known transmission power.
  • the path loss consists of a free-space path loss over the distance d, as well as an additional wall loss Lw.
  • the free-space path loss is independent of frequency and so is equal for measurements on both frequencies.
  • the wall loss is heavily frequency-dependent (lower frequencies are attenuated less than higher frequencies). This difference in attenuation is apparent from the difference in the two path loss measurements L P1 and L P2 , and can be used to estimate the wall losses L W1 and L W2 .
  • PLo is a known parameter and it represents the path loss at a reference distance (usually 1 metre), d is the distance between the user equipment and the base station and ⁇ is a path loss exponent.
  • the distance d between network nodes can be derived from the path loss measurement L p .
  • the network may perform measurements to estimate the losses due to the walls or other obstructions. For example, loss estimation can be performed automatically using three different base stations or other network nodes operating in the environment where the user equipment is expected to operate, as shown schematically in Figure 2 .
  • the estimation is performed by measuring the path losses between each pair of the three base stations at at least two different frequencies, f 1 and f 2 , as will now be explained in more detail.
  • Equation (3) enables the evaluation of ⁇ e .
  • L pif1 (dB) is the path loss between any two base stations at frequency f 1 and d i is the distance between base stations.
  • ⁇ e is calculated using Equation (4) for each pair of the three base stations at frequency f 1 , resulting in three values for ⁇ eif1 .
  • a similar evaluation is performed for ⁇ eif2 .
  • P t and P r stand for the transmitted and received powers, respectively.
  • ⁇ f1 represents the average effective wall attenuation for the environment shown in Figure 2 at the frequency f 1 .
  • a similar expression can be written for the average effective wall attenuation at the frequency f 2 .
  • Figure 3 shows the base station arrangement of Figure 2 , but with the inclusion of user equipment whose location is to be determined.
  • Equation (10) the terms P t f 1 ⁇ 1 - e - 2 ⁇ ⁇ ⁇ f 1 ⁇ k i and P t f 2 ⁇ 1 - e - 2 ⁇ ⁇ ⁇ f 2 ⁇ k i represent the powers absorbed by the walls and are obtained from Equation (7) by replacing the distance d i with a parameter k i ..
  • This parameter k i represents the unknown "thickness" of an obstructed wall with attenuation constants ⁇ f1 and ⁇ f2 at frequencies f 1 and f 2 respectively.
  • d iUE represents the distances from the user equipment to the i-th base station.
  • d 1UE 100 metres
  • d 2 75 metres
  • d 3 150 metres.
  • Isotropic antennas are used at both the transmit and receive ends.
  • the path losses at the reference distance PL 0f1 and PL 0f2 need to be determined. These may be determined at a distance of 1 metre from each base station and are dependent on the parameters of the antennas used in the user equipment and base station. They can be either measured or, provided that the parameters of the antennas are known, calculated.
  • the path loss at the reference distance PL 0if1 (dB) is 31.526 dB and PL 0F2 is 38.01 dB.
  • Equation (8) the values of the attenuation constants are calculated from Equation (8) for each pair of the three base stations at each frequency.
  • d 1UE 7.6 ⁇ m
  • the distance estimate is robust for different wall losses between the base station and the user equipment.
  • the measured path losses are now 61.6577 dB and 72.3737 dB at f 1 and f 2 respectively.
  • the technique mentioned above provides for accurate location estimation which allows measuring and compensating for wall losses between the base stations and the user equipment and thereby enables received power based location estimation without the need for expensive calibration for each building.
  • the quality of the different receivers/antennas for different frequencies may be different, resulting in different losses. This can lead to errors in the path-loss estimation.
  • This problem can be prevented by auto-calibrating the calculation. This can be done by performing measurements for a known location of the network node (e.g. when entering the building) where there are no walls. In this case the path-loss estimate should be equivalent for the two frequencies. Any difference can be stored for the particular mobile and taken into account in the calculations above to correct for the measurement error.
  • the same approach can be used when the wall losses at a specific location are known for the two frequencies.
  • This correction value is required at all points where the distance to the network node is estimated. Therefore the base station that performs the calibration needs to transmit the correction value to all distance measurement points (e.g. other base stations, or a central entity that collects all measurements for the location estimation).
  • This approach provides a cost effective and accurate method to estimate the distance of a mobile to a base station in indoor environments. This enables many location and presence based services and overcomes or alleviates problems existing solutions have due to lack of accuracy indoors or due to expense for accurate indoor positioning.
  • program storage devices e.g., digital data storage media, which are machine or computer readable and encode machine-executable or computer-executable programs of instructions, wherein said instructions perform some or all of the steps of said above-described methods.
  • the program storage devices may be, e.g., digital memories, magnetic storage media such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media.
  • the embodiments are also intended to cover computers programmed to perform said steps of the above-described methods.
  • processors may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software.
  • the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared.
  • processor or “controller” or “logic” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (DSP) hardware, network processor, application specific integrated circuit (ASIC), field programmable gate array (FPGA), read only memory (ROM) for storing software, random access memory (RAM), and non volatile storage. Other hardware, conventional and/or custom, may also be included.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • ROM read only memory
  • RAM random access memory
  • any switches shown in the Figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
  • any block diagrams herein represent conceptual views of illustrative circuitry embodying the principles of the invention.
  • any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.

Claims (15)

  1. Procédé d'estimation d'une distance entre un noeud d'accès au réseau (BS) et un noeud de réseau d'un réseau de communications sans fil, comprenant les étapes suivantes :
    mesurer des affaiblissements totaux sur le trajet entre ledit noeud d'accès au réseau et ledit noeud de réseau à au moins deux fréquences différentes ;
    déterminer les affaiblissements sur le trajet dépendants de la fréquence des transmissions par ledit noeud d'accès au réseau auxdites au moins deux fréquences différentes ; et
    estimer une distance entre ledit noeud de réseau et ledit noeud d'accès au réseau en utilisant lesdits affaiblissements totaux sur le trajet et lesdits affaiblissements sur le trajet dépendants de la fréquence auxdites au moins deux fréquences différentes.
  2. Procédé selon la revendication 1, selon lequel lesdits affaiblissements sur le trajet dépendants de la fréquence sont déterminés à partir d'une différence dans lesdits affaiblissements totaux sur le trajet à chaque fréquence différente entre ledit noeud d'accès au réseau et ledit noeud de réseau.
  3. Procédé selon la revendication 1 ou 2, selon lequel lesdits affaiblissements sur le trajet dépendants de la fréquence sont déterminés à partir des transmissions à chaque fréquence différente entre au moins deux noeuds d'accès au réseau.
  4. Procédé selon l'une quelconque des revendications précédentes, selon lequel lesdits affaiblissements sur le trajet dépendants de la fréquence sont déterminés à partir des transmissions à chaque fréquence différente entre au moins trois noeuds d'accès au réseau.
  5. Procédé selon les revendications 3 ou 4, selon lequel lesdits affaiblissements sur le trajet dépendants de la fréquence sont déterminés à partir des transmissions à chaque fréquence différente et d'une distance entre les noeuds d'accès au réseau.
  6. Procédé selon l'une quelconque des revendications 3 à 5, comprenant la détermination d'un affaiblissement sur le trajet dépendant de la fréquence moyen à chaque fréquence différente entre les noeuds d'accès au réseau.
  7. Procédé selon l'une quelconque des revendications 3 à 6, selon lequel lesdits affaiblissements sur le trajet dépendants de la fréquence à chaque fréquence différente sont déterminés en utilisant une atténuation dépendante de la fréquence effective entre lesdits noeuds d'accès au réseau.
  8. Procédé selon la revendication 7, selon lequel ladite atténuation dépendante de la fréquence effective est déterminée en utilisant un affaiblissement sur le trajet mesuré à chaque fréquence différente entre lesdits noeuds d'accès au réseau et une distance entre lesdits noeuds d'accès au réseau.
  9. Procédé selon l'une quelconque des revendications 3 à 8, comprenant la détermination d'une atténuation dépendante de la fréquence effective moyenne à chaque fréquence différente entre lesdits noeuds d'accès au réseau.
  10. Procédé selon l'une quelconque des revendications précédentes, selon lequel lesdits affaiblissements sur le trajet dépendants de la fréquence sont déterminés à partir d'affaiblissements sur le trajet dépendants de la fréquence prédéterminés approximativement pour des environnements de déploiement différents.
  11. Procédé selon l'une quelconque des revendications précédentes, selon lequel ladite distance est estimée à partir d'un affaiblissement sur le trajet corrigé déterminé en éliminant lesdits affaiblissements sur le trajet dépendants de la fréquence desdits affaiblissements totaux sur le trajet à chaque fréquence différente.
  12. Procédé selon l'une quelconque des revendications 9 à 11, selon lequel ladite distance est estimée en utilisant ledit affaiblissement total sur le trajet, une puissance de transmission et ladite atténuation dépendante de la fréquence effective moyenne à chaque fréquence différente.
  13. Procédé selon l'une quelconque des revendications 3 à 12, comprenant l'estimation d'une distance entre ledit noeud de réseau et chacun desdits noeuds d'accès au réseau.
  14. Noeud de réseau pouvant être utilisé pour estimer une distance entre un noeud d'accès au réseau (BS) et un noeud de réseau (UE) d'un réseau de communications sans fil, comprenant :
    une logique de mesure pouvant être utilisée pour mesurer des affaiblissements totaux sur le trajet entre ledit noeud d'accès au réseau et ledit noeud de réseau à au moins deux fréquences différentes ;
    une logique de détermination pouvant être utilisée pour déterminer les affaiblissements sur le trajet dépendants de la fréquence des transmissions par ledit noeud d'accès au réseau auxdites au moins deux fréquences différentes ; et
    une logique d'estimation pouvant être utilisée pour estimer une distance entre le noeud de réseau et le noeud d'accès au réseau en utilisant les affaiblissements totaux sur le trajet et les affaiblissements sur le trajet dépendants de la fréquence aux au moins deux fréquences différentes.
  15. Produit de programme informatique pouvant être utilisé, lorsqu'il est exécuté sur un ordinateur, pour réaliser les étapes du procédé selon l'une quelconque des revendications 1 à 13.
EP11360050.6A 2011-11-10 2011-11-10 Évaluation de la distance Not-in-force EP2592433B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP11360050.6A EP2592433B1 (fr) 2011-11-10 2011-11-10 Évaluation de la distance
IN3411DEN2014 IN2014DN03411A (fr) 2011-11-10 2012-11-05
JP2014540349A JP2015507172A (ja) 2011-11-10 2012-11-05 距離推定
US14/357,010 US20140323151A1 (en) 2011-11-10 2012-11-05 Distance estimation
CN201280054533.7A CN103917888A (zh) 2011-11-10 2012-11-05 距离估计
KR1020147010052A KR20140069165A (ko) 2011-11-10 2012-11-05 거리 추정
PCT/EP2012/004608 WO2013068095A1 (fr) 2011-11-10 2012-11-05 Estimation de distance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11360050.6A EP2592433B1 (fr) 2011-11-10 2011-11-10 Évaluation de la distance

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EP2592433A1 EP2592433A1 (fr) 2013-05-15
EP2592433B1 true EP2592433B1 (fr) 2016-01-27

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EP (1) EP2592433B1 (fr)
JP (1) JP2015507172A (fr)
KR (1) KR20140069165A (fr)
CN (1) CN103917888A (fr)
IN (1) IN2014DN03411A (fr)
WO (1) WO2013068095A1 (fr)

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US20140323151A1 (en) 2014-10-30
EP2592433A1 (fr) 2013-05-15
KR20140069165A (ko) 2014-06-09

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